Plant growth occurs when cells multiply and enlarge.
How plants grow
To fuel this process,the plant needs energy,and that is why it photosynthesises as follows.The Genius of a plant is the fact that it can harness and store light to help it make energy because ist cell contain clorophyll. The Chlorophyll absorbs the light.Plants use Carbon dixide from the are around them as the starting Point for growing.
Here is the eqution you learned at school but have now forgotten :
carbon dioxide +water ~ carbohydrate+ oxygen
The nutrients that a plant needs for healthy growth are present in soil.Therfore,put quite simply,if your plant soit,water it and keep it in a place where it gets enough light ,you are giving it everything it needs.